Minify on backend
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Ruud
Executable
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"""CSSVariables implements (and only partly) experimental
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`CSS Variables <http://disruptive-innovations.com/zoo/cssvariables/>`_
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"""
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__all__ = ['CSSVariablesRule']
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__docformat__ = 'restructuredtext'
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__version__ = '$Id: cssfontfacerule.py 1818 2009-07-30 21:39:00Z cthedot $'
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from cssvariablesdeclaration import CSSVariablesDeclaration
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import cssrule
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import cssutils
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import xml.dom
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class CSSVariablesRule(cssrule.CSSRule):
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"""
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The CSSVariablesRule interface represents a @variables rule within a CSS
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style sheet. The @variables rule is used to specify variables.
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cssutils uses a :class:`~cssutils.css.CSSVariablesDeclaration` to
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represent the variables.
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Format::
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variables
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VARIABLES_SYM S* medium [ COMMA S* medium ]* LBRACE S*
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variableset* '}' S*
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;
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for variableset see :class:`cssutils.css.CSSVariablesDeclaration`
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**Media are not implemented. Reason is that cssutils is using CSS
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variables in a kind of preprocessing and therefor no media information
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is available at this stage. For now do not use media!**
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Example::
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@variables {
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CorporateLogoBGColor: #fe8d12;
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}
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div.logoContainer {
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background-color: var(CorporateLogoBGColor);
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}
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"""
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def __init__(self, mediaText=None, variables=None, parentRule=None,
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parentStyleSheet=None, readonly=False):
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"""
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If readonly allows setting of properties in constructor only.
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"""
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super(CSSVariablesRule, self).__init__(parentRule=parentRule,
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parentStyleSheet=parentStyleSheet)
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self._atkeyword = u'@variables'
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# dummy
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self._media = cssutils.stylesheets.MediaList(mediaText,
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readonly=readonly)
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if variables:
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self.variables = variables
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else:
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self.variables = CSSVariablesDeclaration(parentRule=self)
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self._readonly = readonly
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def __repr__(self):
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return u"cssutils.css.%s(mediaText=%r, variables=%r)" % (
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self.__class__.__name__,
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self._media.mediaText,
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self.variables.cssText)
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def __str__(self):
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return u"<cssutils.css.%s object mediaText=%r variables=%r valid=%r " \
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u"at 0x%x>" % (self.__class__.__name__,
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self._media.mediaText,
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self.variables.cssText,
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self.valid,
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id(self))
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def _getCssText(self):
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"""Return serialized property cssText."""
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return cssutils.ser.do_CSSVariablesRule(self)
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def _setCssText(self, cssText):
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"""
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:exceptions:
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- :exc:`~xml.dom.SyntaxErr`:
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Raised if the specified CSS string value has a syntax error and
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is unparsable.
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- :exc:`~xml.dom.InvalidModificationErr`:
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Raised if the specified CSS string value represents a different
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type of rule than the current one.
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- :exc:`~xml.dom.HierarchyRequestErr`:
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Raised if the rule cannot be inserted at this point in the
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style sheet.
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- :exc:`~xml.dom.NoModificationAllowedErr`:
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Raised if the rule is readonly.
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Format::
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variables
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: VARIABLES_SYM S* medium [ COMMA S* medium ]* LBRACE S*
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variableset* '}' S*
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;
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variableset
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: LBRACE S* vardeclaration [ ';' S* vardeclaration ]* '}' S*
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;
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"""
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super(CSSVariablesRule, self)._setCssText(cssText)
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tokenizer = self._tokenize2(cssText)
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attoken = self._nexttoken(tokenizer, None)
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if self._type(attoken) != self._prods.VARIABLES_SYM:
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self._log.error(u'CSSVariablesRule: No CSSVariablesRule found: %s' %
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self._valuestr(cssText),
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error=xml.dom.InvalidModificationErr)
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else:
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newVariables = CSSVariablesDeclaration(parentRule=self)
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ok = True
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beforetokens, brace = self._tokensupto2(tokenizer,
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blockstartonly=True,
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separateEnd=True)
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if self._tokenvalue(brace) != u'{':
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ok = False
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self._log.error(u'CSSVariablesRule: No start { of variable '
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u'declaration found: %r'
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% self._valuestr(cssText), brace)
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# parse stuff before { which should be comments and S only
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new = {'wellformed': True}
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newseq = self._tempSeq()#[]
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beforewellformed, expected = self._parse(expected=':',
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seq=newseq, tokenizer=self._tokenize2(beforetokens),
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productions={})
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ok = ok and beforewellformed and new['wellformed']
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variablestokens, braceorEOFtoken = self._tokensupto2(tokenizer,
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blockendonly=True,
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separateEnd=True)
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val, type_ = self._tokenvalue(braceorEOFtoken), \
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self._type(braceorEOFtoken)
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if val != u'}' and type_ != 'EOF':
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ok = False
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self._log.error(u'CSSVariablesRule: No "}" after variables '
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u'declaration found: %r'
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% self._valuestr(cssText))
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nonetoken = self._nexttoken(tokenizer)
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if nonetoken:
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ok = False
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self._log.error(u'CSSVariablesRule: Trailing content found.',
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token=nonetoken)
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if 'EOF' == type_:
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# add again as variables needs it
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variablestokens.append(braceorEOFtoken)
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# SET but may raise:
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newVariables.cssText = variablestokens
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if ok:
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# contains probably comments only upto {
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self._setSeq(newseq)
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self.variables = newVariables
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cssText = property(_getCssText, _setCssText,
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doc=u"(DOM) The parsable textual representation of this "
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u"rule.")
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media = property(doc=u"NOT IMPLEMENTED! As cssutils resolves variables "\
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u"during serializing media information is lost.")
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def _setVariables(self, variables):
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"""
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:param variables:
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a CSSVariablesDeclaration or string
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"""
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self._checkReadonly()
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if isinstance(variables, basestring):
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self._variables = CSSVariablesDeclaration(cssText=variables,
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parentRule=self)
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else:
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variables._parentRule = self
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self._variables = variables
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variables = property(lambda self: self._variables, _setVariables,
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doc=u"(DOM) The variables of this rule set, a "
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u":class:`cssutils.css.CSSVariablesDeclaration`.")
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type = property(lambda self: self.VARIABLES_RULE,
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doc=u"The type of this rule, as defined by a CSSRule "
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u"type constant.")
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valid = property(lambda self: True, doc='NOT IMPLEMTED REALLY (TODO)')
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# constant but needed:
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wellformed = property(lambda self: True)
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